Heat (thermal) energy is another form of kinetic energy. This form of energy is the internal energy in a substance. Heat energy is the vibration and movement of atoms and molecules within a substance. Geothermal energy is an example of heat energy.

The last of the 7 forms of energy mentioned in the previous pages is electrical energy. Electrical energy is also an example of energy in motion. It is the movement of electrons. Lightning and electricity are exampls of electrical energy.

The world around us is full of energy. Energy exists in many forms. A lightning bolt has electrical energy. A flashlight has chemical energy. A moving bicycle has mechanical energy. We harness various forms of energy to power tools and machines from flashlights to submarines.

Energy readily changes from one form to another. The law of Conservation of Energy states that "Energy cannot be created or destroyed."

In other words, the total amount of energy in the universe never changes, although it may change from one form to another. Energy never disappears, but it does change form.

When we eat our food has stored energy in it. If we take a bite of our food and chew we are using mechanical energy ,as the food moves down to our stomach and through our intestines the mechanical energy is turned into chemical energy. If we play sports after we eat or do something that requires alot of physical activity that chemical energy is turned into heat energy.